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- Need explanation for: A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed (1/2) m away, the number of electrons emitted by photocathode would
A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed (1/2) m away, the number of electrons emitted by photocathode would
| Option 1)
decrease by a factor of 2 |
Option 2)
increase by a factor of 2 |
| Option 3)
decrease by a factor of 4 |
Option 4)
increase by a factor of 4 |
Answers (1)
As we learnt in
Effect of intensity on photoelectric current -
For a fixed frequency, the photolelectric current increases linearly with increase in intensity of light
- wherein
Since Intensity
When distance become half intensity becomes 4 times
Hence number of electrons increases by factor of 4.
Correct answer is 4.
Option 1)
decrease by a factor of 2
This is an incorrect option.
Option 2)
increase by a factor of 2
This is an incorrect option.
Option 3)
decrease by a factor of 4
This is an incorrect option.
Option 4)
increase by a factor of 4
This is the correct option.
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